Extension rule



May 24, 1927. 1,629,829

., C. o. LINN EXTENSION RULE Filed June 9v. 1925 entre STATES PATENr Fries.

CARL 0. LINN, 0F SALINA, KANSAS.

The invention this character EXTENSION; RULE.

Application area V:rune 9, i925.- scriai No. 35,934.

relates to extension rules, rule is extended. and has for its object to provide a device of comprising a plurality of telescopically engaged metallic sections having overlying registering flanges 1n' slidable engagement with ried by the end operating inward and with each other outward movement of the seceach other and means cars of theV sections and cofor limiting-the tions in relationto each other, thereby main taining` the sections in registration when in contracted position,

and preventing the seetions from coming out of interengagement with each other when extended.

A further object is to provide ends of the sect cesses and lugs,

is contracted receives the one of the ions with semicircular rewhich recesses when the rule lugs and limits the inward movement thereof.

A further object is to provide the flanges ofthe sections at one of their ends with outwardly extending lugs ders, and lugs carried the sections extending edges of the flanges in the overlying the forming shoul by the other ends of downwardly and path ofthe outwardly extending lugs for limiting the movement of the sections when the rule is extended. i

With the above andother objects in view the invention resides in arrangement of forth, shown in the drawings,

it being understood that changes claimed,

the combination and hereinafter set parts as described and in the precise lembodiment* of the invention may be made within the scope of what is claimed without of the invention.

departing from the spirit In the drawing Figure l Vis a perspective View of the ruleV in closed position,

Figure 2 is a casing.

F1 gure and within a casing. top plan view of the rule 3 is a perspective view of the rule showing the same partially extended.

Figure 4 is a vertical longitudinal sec` tional view through the ends of two of the rule sections showing the limiting means.

Referring to the drawing, the numeral l designates a plurality oftelescopically engaged rule sections, which sections are pro'- vided with graduations 2 for measuring PUIPOSGS.

The sections 1 are provided with slidably engaged inwardly extending flanges 3 and 4, which flanges when the rule is m collapsed position register with each other,

and which are s lidably engaged when the The flanges 4 at one of their ends are provided with inwardly extending lugs 5 formed integral therewith, which lugs, when the rule sections are extended, engage the downwardly extending integral lugs 6, which everlie the inner edges of the flanges 4 and limit the outward movement of the rule sections in relation to each other when the rule is extended Afor use. Flanges 4 adjacent one of their ends are provided with upwardly extendinglugs 7, which lugs are out of alinementwith each other and are received in recesses 8 in the adjacent ends of the flanges 4 for limiting the inward movement of the rule sections and substantially holding the same when in collapsed position in registration as clearly shown in Figures l and 4. The rule sections are made from sheet metal stamped to form, therefore accuracy is assured at all times as well as a durable rule. It will also be seen as many rule sections as desired may be used, and a relatively long rule may be provided, which will collapse into a small package, thereby allowing the same to occupy a minimum amount of room in the pocket of the user, and by forming the device from metal it is obvious the rule will not be easily damaged or the graduations obliterated incident to constant use of the rule, which is a common difficulty now experienced with wooden rules.

From the above it will be seen a telescoping .rule is provided which is extremely simple in construction, formed ,from sheet metal, stamped and bent to form, and the limiting means for limiting the movement inwardly and outwardly of the telescopically engaged sections is simple in construction and will not interfere with the use of the rule during a measuring operation.

The device is preferably provided with a tulmlarcasing 9 in which the rule may be stored when not in use, thereby protecting the same from accumulation of dirt between the slidably engaged parts.

The invention having being laterally off-set with relation to one another and all the sections, eXcept the innermost, being provided adjacent their recessed ends with outwardly projecting lugs, each adapted, when the sections are closed together, to enter the recess of the outwardly adjacent section and to abut against the end wall of the recess to thus limit the inward movement of the sections.

2. A rule comprising a plurality of longitudinally chambered sections, slidably telescoped one within the other, the chambers of each section, except the outermost, being `formed in part by oppositely and inwardlybent longitudinal flanges, the corresponding flanges o the different sections being in superposed relation thusI forming two sets l of superposed flanges, one of the corresponding ends of one set being each recessed, there being adj acentthe other ends of said set lugs projecting vfrom the lateral edges of the flanges, the recess of each ange being laterally 03E-set with relation to those of adjacent flanges and the recessed ends being also provided with outwardly projecting lugs, each positioned to enter the recess of the adjacent superposed flange, when the sections are closed together, and with inwardly bent lugs, each adapted to abut against the lateral-edge lug of the inwardly adjacent llange when the rule is distended.

In testimony whereof I have signed my naine to this specication.

CARL o.v LINN. 

